curple

curple /KƏR-pəl/. noun. The rump; the buttocks. Particularly an equine’s hind-quarters, AKA a horse’s ass. A corruption of crupper, which could refer to either the rump of a horse or a strap that passed under the tail to secure a saddle. From the French croupière, from medieval Latin and Italian groppa.

“I’m afraid that John Durie has cracked his curple, at least his mouth is closed.” (James Carmichael)